External links

ISO 2047

ISO 2047 (Information processing -- Graphical representations for the control characters of the 7-bit coded character set) ISO/IEC 646 describes a graphical representation of the control characters for debugging purposes, such as may be found in the character generator of a computer terminal; it also establishes a two-letter abbreviation of each control character. In addition, RFC 1345 "Character Mnemonics & Character Sets" is cited as the ISO 2047 two-letter abbreviation of the control character. ISO 2047, ECMA-17 in Europe, GB/T 3911-1983 in China, that corresponds to KS X 1010 in Korea (formerly KS C 5713) has been established as a standard. It was enacted "graphical representation of information exchange capabilities for character" JIS X 0209:1976 (former JIS C 6227) in Japan, and was abolished on January 20, 2010.

Standard Generalized Markup Language

Markup should be declarative: it should describe a document's structure and other attributes, rather than specify the processing to be performed on it. Declarative markup is less likely to conflict with unforeseen future processing needs and techniques.

Markup should be rigorous so that the techniques available for processing rigorously-defined objects like programs and databases can be used for processing documents as well.

HTML was theoretically an example of an SGML-based language until HTML 5, which admits that browsers cannot parse it as SGML (for compatibility reasons) and codifies exactly what they must do instead.

DocBook SGML and LinuxDoc are better examples, as they were used almost exclusively with actual SGML tools.

Standard versions

SGML is an ISO standard: "ISO 8879:1986 Information processing– Text and office systems– Standard Generalized Markup Language (SGML)", of which there are three versions: